Automatic all y-ad just able wrench



A. SPRUP. AUTOMATICALLY ADJUSTABLE WRENCH. APPucATloN mio APR.11,19|8.

katened June 3, 1919.

" paran? ANDREW srormr, or EUREKA, CALIFORNIA.

AUTOMATICALLY-ADJUSTABLE VVRENC-I.`

Specification of Letters Patent.

- Patented une 3, 1919.

Application filed April 11, 1918. Serial No. 227,938.

To all Lo/tom it may concern:

. Be it known that I, ANDREW SPORUP, a citizen of the United States,residing at ltlureka, in the county of Humboldt and State of California,have invented certainnew and useful Improvements in Automatically-Adjustable Vrenches; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to kwhich it appertains to make and use thesame.

This invention relates to wrenches and it relates more particularly toan automatically adjustable wrench for turning either cylindrical orprismatic bodies.

One of the objects of this invention is to provide a wrench which isequally eflicient as v a nut wrench and as a pipe wrench;

which the jaws remain approximately parat;

lel in every adjusted position;

Another object is to provide a wrench of this character which isconvenient to manipulate for opening and closing;

Another object is to provide a wrench of this character which is strong,durable and compact; and- Another object is to provide'a wrench of thischaracter which is composed of few and simple parts and may bemanufactured at a comparatively slight cost.

Other objects and advantages may become apparent to persons who read thefollowing details of description in connection with the accompanyingdrawings, in which:

Figure 1 is a side elevation of my improved wrench;

Fig. 2 is a similar view, except that one of the connecting plates orlinks is removable.

Fig. 3 is a top plan view of the wrench,

Fig. 4L is a view disclosing a portion of the wrench having the jaws ina, partially closed position and in engagement with a cylindricalobject; and- F ig. 5 is a transverse sectional View along the line ,-ofFig. 2.

Referring to the drawings in detail in which similar referencecharacters correspond with similar parts throughout the several views,the wrench consists of separable members or elements 6, 7, 8, 9, 10, 11and 12. The element G constitutes the major element and consists of ahandle 13, a jaw 14 and a cam 15, this member being apertured at thebase of the cam 15, as indicated at 16.

The minor element 7 consists of a jaw 17, a manipulative element orthumb-piece 18 and a convexed element or abutment 19. The cam 15terminates in a concaved portion which receives the abutment 19 andconstitutes a complemental abutment which cooperates with the pin, studor abutment 10 for limiting movement of the major and minor members withrelation to one another, as will hereinafter become apparent.

Each of the plat-es or links S and 9 has a slot or aperture 2Otherethrough, and the studs or ends of pin 10 extend through theapertures 20 and abut against the plates at the upper ends of theseapertures so as to limit movement of the member 7 with relation to thelinks 8 and 9, and it will be seen that the pin 10 thus coperates withthe abutment 19 for limiting movement of the member 7, while keeping thelatter constantly parallel with the jaws 14. However, when the member 7approaches the jaw 14 while the abutment 19 slides along the cam 15, thepoints or free ends of the jaws move toward one another somewhat fasterthan the remaining portions of jaws move and, therefore, although thejaws remain in an approximately parallel relation, they convergesomewhat toward their free ends, thereby providing the maximum holdingeiliciency.

In order that the maximum convenience may be obtained in opening andclosing the jaws, I provide one or both of the plates 8 and 9 withmanipulative elements 21 and 22. The manipulative element 21 projectsbeyond the manipulative element 18 in the direction of the free end ofthe jaw 17, thereby providing a very convenient means for swinging theplates backward by means of a thumb, or linger until the cam l5 hasraised the manipulative element 18 sufficiently to*- become. operativefor. completing the rear'- ward movement, that is, the movement.V

whereby the jaws are opened.,. The manipulative element 22 is alsoconvenient f or opening the jaws; this element being dis posedconveniently for operation by a thumb or linger when using. b

The plates 8 and 9,being relatively broad,

serve to hold the members 6 andf'l inproper.;

holdingv them in coperativerelation for:

engagingI an object" to be turned, iand oppo-` sitely extendingy studsonsaid minor: mem

ber adapted to move againstl one of; said links so `as tolimitmovementfof saidfminorf member with relation to said links.`

2. In a wrench, a major member consist"- ing ofv a handle and a1jaWandia cam and having an aperture therethrough at: the base of-'said-cam,aiminor elementcompris- Y ing a jawl and a manipulative element andfhaving an aperturetherethrough, a pair-'of` and pivots4 extendingapertured links, throughv saidV links and through the` aper- Gopiesofthisv patentmaybe obtained forw cents eachyby addressing; theVG'ommssonerrofj Patents,

tures of said major and minor members to movably secure these memberstogether in such relation thata partof saidminormembercail move on saidcam when said' manipulative. elementv is..Y properly manipulated, saidcam being of the proper shape to keep the jawv of said: minor memberapproximately parallel with the jaw of said major member ineach of theworking positions of the jaws.

3. Ina-wrench, a major member consist ing of a handle and a jaw and acam and having an aperture therethrough at the base of saidcam,`am-inorelement comprising a jaw and a-.manipnlative-element and havingan: aperturetherethrough, a; pair.V of apertured4 links, providedY with1 a` manipulative elementy and'. pivots extending through'y saidlinksfandathrough fthe'apertures of said major; andminormemberstormovablyl secure these members in such relationthat a partofsaid minor member cany move on said cam whenethe irst saidmanlpulatlve'eles ment:` 1s properly mampulated, said'cam being." of?the proper-1' shape to 2 keep the; jaw of said minor Ymember.approximately parallel` with the jaw of saidimajorfmemberrin: each of;the working' positions ofiY the jaws,f. the

manipulative.v element of.' said: links: being; operable tov move the'first `said@manipulative-v element intopositiongfor itseffective/.manipulation.A f

In testimony 'whereof I- have hereunto set` my hand in the presenceofztwoasubscribing lVitnesses:

PinncnI-I RYAN, A. L. PENNELL.-

Washington, D. C.

